Brian McNamee, former personal trainer for steroid-scandal-scarred ex-Yankee pitcher Roger Clemens, passed out behind the wheel of his car and was in a head-on crash with a Queens bus yesterday, authorities said.

Police and fire officials said there only minor injuries were reported after the 12:35 p.m. crash, which involved two cars and a city bus, at Beach 9th Street and Central Avenue in Far Rockaway.

McNamee, a diabetic, passed out while driving his 2003 Lexus and plowed into the bus, police sources said. The other car then smashed into McNamee’s.

No charges were filed.

The bus driver and five passengers were taken to St. John’s Episcopal Hospital for treatment, cops said.

A lawyer for McNamee said he had no immediate information on his condition or further details of the accident.